The Book of Greetings
39/8. Chapter:
The Prohibition Of Being Alone With A Non-Mahram Woman Or Entering Upon Her
Sahih Muslim
وَحَدَّثَنِي أَبُو الطَّاهِرِ، أَخْبَرَنَا ابْنُ وَهْبٍ، قَالَ سَمِعْتُ اللَّيْثَ بْنَ سَعْدٍ، يَقُولُ الْحَمْوُ أَخُ الزَّوْجِ وَمَا أَشْبَهَهُ مِنْ أَقَارِبِ الزَّوْجِ ابْنُ الْعَمِّ وَنَحْوُهُ .
Ibn Wahb reported: I heard Laith b. Said as saying: Al-Hamv means the brother of husband or like it from amongst the relatives of the husband, for example, cousin, etc.
Reference : Sahih Muslim 2172cIn-book reference : Book 39, Hadith 30USC-MSA web (English) reference : Book 26, Hadith 5402